Her Job: Jewel Burks, 25, is the CEO and cofounder of Partpic, a visual-search engine for replacement parts; she's also a "diversity evangelist" at Google, teaching black, Hispanic, and female business owners how to grow their businesses online. "I don't sleep much," she says, "but I'm doing things I'm passionate about."

Her Look Here: "I love how breezy this printed yellow dress is. By itself, it's the ideal thing to wear out on a hot summer night in Atlanta, but the long vest gives it a professional edge."

Her Start-up Style: "I'm usually pressed for time, so a bright dress is my secret weapon. It's one easy piece that commands attention. My signature look for presentations is an orange sheath, because it's memorable and the same color as Partpic's logo. The general start-up uniform is a company T-shirt with a blazer and jeans; compared to that casual outfit, I feel like I stand out and can kill the presentation."

Her Job: As the director of product strategy and partnerships at CNN's sister network HLN, Karyn Lu, 35, is reinventing the channel as a home for the social media generation. "We want to cover what people are hearing, searching, talking about, buying, and playing," she says. "It's about making viewers part of the conversation."

Her Look Here: "Wearing color inspires creativity, so I gravitate toward vibrant hues like this cobalt blue top. With the patterned skirt, it's a great look for a networking event or public speaking engagement." Her wardrobe hack: "I have a two-year-old son and play violin in a band. I don't have much time to shop, so I subscribe to a service called Stitch Fix, which tailors clothes to your style and delivers them to your doorstep each month."

Her Finishing Touches: "I get a lot of compliments on my accessories. I'm never without a necklace or unique earrings. I like how jewelry can transform the same looks week after week."